Warning from Space
Japanese film poster
Directed by	Koji Shima
Produced by	Masaichi Nagata
Written by	Hideo Oguni (screenplay) Gentaro Nakajima (novel) Jay Cipes (English dialogue) Edward Palmer (English dialogue)
Starring	Keizo Kawasaki Toyomi Karita Bin Yagasawa Shozo Nanbu Bontarô Miyake Mieko Nagai Kiyoko Hirai Isao Yamagata
Music by	Seitaro Omori
Cinematography	Kimio Watanabe
Editing by	Toy Suzuki
Studio	Daiei Film
Distributed by	Daiei (Japan) AIP-TV (USA)
Release dates	January 29, 1956 (Japan) October 21, 1957 (UK) 1963 (US)
Running time	87 minutes (Japan) 88 minutes (US)
Country	Japan
Language	Japanese

Warning from Space or Mysterious Satellite (宇宙人東京に現わる Uchūjin Tokyo ni arawaru^?, Spacemen Appear in Tokyo) is a Japanese science fiction tokusatsu film released in January 1956 by Daiei, and was the first Japanese science fiction film to be produced in color. In the film's plot, starfish-like aliens disguised as humans travel to Earth to warn of the imminent collision of a rogue planet and Earth. As the planet rapidly accelerates toward Earth, a nuclear device is created at the last minute and destroys the approaching world.

The film, directed by Koji Shima, was one of many early Japanese monster films quickly produced after the success of Toho's Godzilla in 1954. The film was loosely based on a novel by Gentaro Nakajima. After release, the film was met with negative reviews, with critics calling it "bizarre" and accusing it of using science fiction clichés. Warning from Space influenced many other Japanese science fiction films, such as Gorath.